Resharding overview
Note
This feature is a work in progress. Support for resharding with logical replication was started in #279.
Resharding adds more nodes to an existing database cluster, spreading the data evenly between all machines. Depending on which sharding function is used, this may require recomputing shard numbers for all rows and move them between databases.
Hash-based resharding
PgDog's strategy for resharding for hash-sharded clusters is to create a new cluster with N x 2 nodes (N is the number of nodes in the existing cluster) and move all data to the new cluster without downtime using logical replication.